讲座题目：Impacts of bottom-trawling on long-term carbon storage in shelf sea sediments
主讲人：Wenyan Zhang 教授
主持人：葛建忠 研究员
开始时间：2025-03-25 14:10
讲座地址：闵行校区河口海岸大楼A204
主办单位：河口海岸科学研究院
报告人简介：
Dr. Wenyan Zhang is head of the department Sediment Transport and Morphodyamics in the Institute of Coastal Systems - Analysisand Modeling, Helmholtz-Zentrum Hereon. His expertise mainly lies on sediment dynamics, coastal morphodynamics and benthic-pelagic coupling. In particular, the role of benthic fauna and flora in morphodynamics and carbon cycling is the focus of interest. Dr. Zhang has published more than 90 peer-reviewed research papers since 2010 with h-index=28 (Google Scholar), Scopus & WoS h-index= 23. He is member of the expert group Climate change in the Baltic Sea of HELCOM (lead author of coastal sediment transportation), and member of ICES working groupsFisheries Benthic Impact and Trade-offs (WGFBIT) and Impact of Fishing on Oceanic Carbon (WKFISHCARBON).
报告内容：
Bottom trawling represents the most widespread anthropogenic physical disturbance to shelf sea sediments. While trawling-induced change in benthic communities has been widely recognized, current evidence of its impact on long-term organic carbon (OC) storage in seabed sediments remains contested. To address this we firstly examined two independent datasets, one for the global shelf seas and the other for a heavily trawled region, the North Sea. A clear pattern emerges when comparing the surface sediment OC-to-mud ratio (OC/mud) and the trawling intensity represented by the multi-year averaged swept area ratio (SAR). OC/mud is relatively scattered where SAR < 1 but is increasingly confined into a narrower and lower range with larger SAR. We then applied three-dimensional physical–biogeochemical modeling to investigate the driving mechanisms behind this relationship. Results suggest that in the long term, intense and persistent trawling (SAR > 1) results in a systematic reduction of sedimentary carbon. The identified dependence of OC/mud on trawling, and associated process-based understanding could help to assist both national and international marine spatial plans for climate change mitigation.
